ISO/IEC 15775:1999
(Main)Information technology — Office machines — Method of specifying image reproduction of colour copying machines by analog test charts — Realisation and application
Information technology — Office machines — Method of specifying image reproduction of colour copying machines by analog test charts — Realisation and application
This International Standard applies to implementation and application of test charts for colour copying machines. This International Standard serves for testing of reproduction properties of colour copying machines, in order to help to recognize the possibilities and limits of various machines and for their comparison. To use this International Standard, make copies of at least two test charts (one achromatic and one chromatic) out of eight test charts using the device to be tested. The resulting copies shall be examined visually and may be compared with the original test charts. Objective measurements may be made for these copies. Eight ISO-test charts, four in halftone (offset reproduction) and four in continuous tone (photographic reproduction), belonging to this International Standard may be produced by different manufacturers. Information about where to obtain test chart layout and colorimetric L*a*b* data to produce the charts may be found in Annex M. All hard copy patterns (analog test charts) produced according to this International Standard should be discarded after three years.
Technologies de l'information — Machines de bureau — Méthode de spécification de la reproduction d'image des copieuses couleur par des organigrammes d'essai analogiques — Réalisation et application
General Information
Relations
Buy Standard
Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 15775
First edition
1999-12-01
Information technology— Office
machines — Method of specifying image
reproduction of colour copying machines
by analog test charts — Realisation and
application
Technologies de l'information — Machines de bureau — Méthode de
spécification de la reproduction d'image des copieuses couleur par des
organigrammes d'essai analogiques — Réalisation et application
Reference number
ISO/IEC 15775:1999(E)
©
ISO/IEC 1999
---------------------- Page: 1 ----------------------
ISO/IEC 15775:1999(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO/IEC 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body
in the country of the requester.
ISO copyright office
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 734 10 79
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO/IEC 1999 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC 15775:1999(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards through technical committees established by the
respective organization to deal with particular fields of technical activity. ISO and IEC technical committees
collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in
liaison with ISO and IEC, also take part in the work.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 15775 was prepared by DIN (as DIN 33866) and was adopted, under a special
“fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its
approval by national bodies of ISO and IEC.
Annexes A to M of this International Standard are for information only.
© ISO/IEC 1999 – All rights reserved iii
---------------------- Page: 3 ----------------------
INTERNATIONAL STANDARD ISO/IEC 15775:1999(E)
Information technology ––
Office machines ––
Method of specifying image reproduction of colour copying machines by
analog test charts ––
Realisation and application
1. Scope
This International Standard applies to implementation and application of test charts for colour copying machines.
This International Standard serves for testing of reproduction properties of colour copying machines, in order to help
to recognize the possibilities and limits of various machines and for their comparison.
To use this International Standard, make copies of at least two test charts (one achromatic and one chromatic) out of
eight test charts using the device to be tested. The resulting copies shall be examined visually and may be
compared with the original test charts. Objective measurements may be made for these copies.
Eight ISO-test charts, four in halftone (offset reproduction) and four in continuous tone (photographic reproduction),
belonging to this International Standard may be produced by different manufacturers. Information about where to
obtain test chart layout and colorimetric L*a*b* data to produce the charts may be found in Annex M.
All hard copy patterns (analog test charts) produced according to this International Standard should be discarded
after three years.
2. Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possiblibity of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 216:1975, Writing paper and certain classes of printed matter – Trimmed sizes – A and B series.
ISO 536:1995, Paper and board – Determination of grammage.
ISO 554:1976, Standard atmospheres for conditioning and/or testing – Specifications.
ISO 2469:1994, Paper, board and pulps – Measurement of diffuse reflectance factor.
ISO 2471:1998, Paper and board – Determination of opacity (paper backing) – Diffuse reflectance method.
ISO 2846-1:1997, Graphic technology – Colour and transparency of ink sets for four-colour-printing – Part 1:
Sheetfed and heat-set web offset lithographic printing.
ISO 5627:1995, Paper and board – Determination of smoothness (Bekk method).
ISO 5651:1989, Paper board and pulps – Units for expressing properties.
ISO 5737:1983, Prints – Preparation of standard prints for optical tests.
ISO 7724-1:1984, Paints and varnishes – Colorimetry – Part 1: Principles.
ISO 7724-3:1984, Paints and varnishes – Colorimetry – Part 3: Calculation of colour differences.
ISO 8596:1994, Ophthalmic optics – Visual acuity testing – Standard optotype and its presentation.
ISO 8597:1994, Optics and optical instruments – Visual acuity testing – Method of correlating optotypes.
ISO 12641:1997, Graphic technology – Prepress digital data exchange – Colour targets for input scanner calibration.
ISO/CIE 10526:1991, CIE standard colorimetric illuminants.
ISO/CIE 10527:1991, CIE standard colorimetric observers.
CIE publ. 13.3:1995, Colour rendering – Method of Measuring and Specifying Colour Rendering Properties of Light
Sources.
CIE publ. 15.2:1986, Colorimetry.
DIN 6160:1996, Anomaloscopes for the diagnosis of red-green colour vision deficiencies (or equivalent).
DIN 33866-2:1998, Information technology – Office machines – Colour image reproduction devices – Method of
© ISO/IEC 1999 – All rights reserved
1
---------------------- Page: 4 ----------------------
ISO/IEC 15775:1999(E)
specifying image reproduction of colour copying machines by analog test charts.
DIN 58220-5:1996, Test of visual acuity – Part 5: General test of vision.
ITU-R BT.709-2:1995, Parameter Values for the HDTV Standards for Production and International Programme
Exchange.
3. Definitions
For the purposes of this International Standard the following definitions apply.
3.1
colour rendering
relation between the original colour of an object and its reproduction colour either exclusively under other illuminant
or additionally after passing through a transfer process
NOTE For calculation with colours of this International Standard see Annex G.
3.2
original colour
the perceived colour of an object in reference condition which is being referred to at the assessment of the colour
rendering
3.3
non-luminous (perceived) colour
colour of a non-luminous colour, i. e. an area that requires a reflecting light for its appearance
3.4
standard tristimulus values X, Y, Z
describe the psychophysical colour
NOTE 1 Standard tristimulus values are mostly received as an immediate result of a colour measurement
NOTE 2 As standard tristimulus values only allow statements referring to equality of two colours, for
statements made beyond that, e. g. concerning the kind and size of colour differences, non-linear
transformations of X, Y, Z into other colorimetric parameters systems preferably into the colorimetric
parameters L*, a*, b* are necessary.
3.5
colour difference ∆E*
ab
specifies the size of the difference between two colour stimuli
3.6
lightness L*
the power of a perceived light (inseparably combined with perceived colour)
3.7
chroma C*
the difference of a colour from the equal light achromatic colour
NOTE The saturation describes the ratio of chroma to lightness (C* / L*).
3.8
Landolt-ring
standard optotype defined by a ring with an open segment which can be in 8 different positions
4. Test Charts
This International Standard identifies the techniques to manufacture test charts. Four test charts are produced by
different manufacturers both in halftone and continuous tone. For the tests according to this International Standard
two or more out of eight test charts are used, at least one achromatic test chart (1 or 3) and at least one chromatic
test chart (2 or 4),
On each test chart there is a picture area and a frame area around it, see Figure 1. Each of the test charts 1, 2, 3
and 4 contains a form (see Annex A, B, C, and D respectively) used for visual tests of the picture area and two forms
(see Annex E and F) used for tests of the frame area around it.
At least four forms must be filled out, two for an achromatic test chart (no. 1: form A and E or no. 3: form C and E)
and two for a chromatic test chart (no. 2: form B and F or no. 4: form D and F). The four forms filled out should
belong to two test charts both either in halftone or continuous tone.
NOTE Colour copying machines are often used for reproduction of achromatic charts. Therefore an
achromatic test chart should also be used for testing colour copying machines.
© ISO/IEC 1999 – All rights reserved
2
---------------------- Page: 5 ----------------------
ISO identification: 19980615-I00 ISO-reference material: code=rha4ra-I00
Technical informations: (e.g. Web-site) Layout-file version IE−0CSA698
ISO/IEC 15775:1999(E)
4.1 Material of test charts
The material of test charts depends on whether the chart is halftone or continuous tone.
4.1.1 Examples of material for halftone test charts available as ISO 15775 test charts.
2
Test Chart 1: Photographic paper for black and white pictures, glossy, 85 g/m
2
Test Chart 2: Fine art paper, glossy, natural white, non-fading, 100 per cent non-chlorine bleached, 150 g/m
2
Test Chart 3: Fine art paper, glossy, natural white, non-fading, 100 per cent non-chlorine bleached, 150 g/m
2
Test Chart 4: Fine art paper, glossy, natural white, non-fading, 100 per cent non-chlorine bleached, 150 g/m
Characteristic of example production see Table L.1. in Annex L.
4.1.2 Examples of materials for continuous tone test charts available as ISO 15775 test charts
2
Test Chart 1: Photographic paper for colour pictures, glossy, 225 g/m
2
Test Chart 2: Photographic paper for colour pictures, glossy, 225 g/m
2
Test Chart 3: Photographic paper for colour pictures, glossy, 225 g/m
2
Test Chart 4: Photographic paper for colour pictures, glossy, 225 g/m
Characteristic of example production seeTable L.2 in Annex L.
4.2 Layout of test charts
The layout of the test charts is defined in the standard format A4 (297 mm x 210 mm) within PostScript(PS)-files (or
equivalent). The following layout is reduced to half size. One can find the layout in standard format A4 on different
web servers (see Annex M). The following figures 1 to 3 show the layout and in figures 4 to 7 the content is shown.
4.2.1 Basic layout of the picture area and the frame area around
−2 −2
−4 −4
−6 −6
−8 V L O Y M C −8
Order information of production company (e.g. Web-site) for ISO-test chart (e.g. code=rha4ra-I00)
left top position mark: right top position mark:
xltp = 17 mm, yltp = 193 mm xrtp = 279 mm, yrtp = 193 mm
C V
left top grey scale (center of square N): right top grey scale (center of square N):
xltg = 28 mm, yltg = 197 mm, s = 7 mm xrtg = 239 mm, yrtg = 197 mm, s = 7 mm
xl1 = 28 mm, yl1 = 153 mm xl2 = 86 mm, yl2 = 153 mm xr1 = 161 mm, yr1 = 153 mm xr2 = 219 mm, yr2 = 153 mm
M L
Y O
xl3 = 28 mm, yl3 = 109 mm xl4 = 86 mm, yl4 = 109 mm xr3 = 161 mm, yr3 = 109 mm xr4 = 219 mm, yr4 = 109 mm
O Y
xl5 = 28 mm, yl5 = 65 mm xl6 = 86 mm, yl6 = 65 mm xr5 = 161 mm, yr5 = 65 mm xr6 = 219 mm, yr6 = 65 mm
left bottom position mark: right bottom position mark:
L M
xlbp = 17 mm, ylbp = 17 mm xrbp = 279 mm, yrbp = 17 mm
left bottom grey scale (center of square N): right bottom grey scale (center of square N):
xlbg = 28 mm, ylbg = 12 mm, s = 7 mm xrbg = 239 mm, yrbg = 12 mm, s = 7 mm
V xl7 = 28 mm, yl7 = 21 mm xl8 = 86 mm, yl8 = 21 mm xr7 = 161 mm, yr7 = 21 mm xr8 = 219 mm, yr8 = 21 mm C
Test chart no. 0 for color devices according to ISO 15775: compare www.actech.com.br/sc28
−8 −8
−6 C M Y O L V −6
−4 −4
−2 −2
INFIE03:IE−0CS36.EPS
Figure 1: Basic layout of the figures and the frame area around
Figure 1 shows the basic layout of the test charts which includes in the central area the layout of 16 pictures (without
content) and in the frame area around text and other elements. The basic format is A4 (297 mm x 210 mm)
described by the outer rectangle. The inner rectangle has a thicker line (0,30 mm instead of 0,15 mm) and the size is
282 mm x 194 mm.
Figure 1 includes x- and y-data in mm for all test elements shown with an arrow point at the left bottom corner of the
© ISO/IEC – All rights reserved
3
---------------------- Page: 6 ----------------------
ISO identification: 19980615-I0(1/3) ISO-reference material: code=rha4ra-I0(1/3)
Technical informations: (e.g. Web-site) Layout-file version IE−0CSA698
ISO /IEC 15775:1999(E)
format A4. One can find the x- and y-data of:
left bottom corner of 16 pictures
four position marks
center of four squares with black colours N of a 5-step grey scale
five rectangles located 2 mm up and to the right compared to the outer one and 4 mm smaller on both sides.
NOTE 1 Arrows help to detect the distance to the outer rectangle of the format A4. There is no visual test
based on arrows within this International Standard.
NOTE 2 There are some additional lines dividing the format A4 in four equal formats A6. There is a need to
get the pixel picture B1 (equal to D1) in the format A6 and on slide and negative film for special applications.
The four parts of the format A6 can be mounted to one part of the format A4 if this is useful for special
applications.
NOTE 3 The position marks allow exact positioning of colorimeters to measure the L*a*b* colorimetric data
for the colour samples in the test charts. Figures 2 and 3 includes the position data of all samples in all test
charts and simplifies colorimetric measurements.
4.2.2 Layout of the picture area and the frame area around of test charts 1 to 4
−2 −2
−4 −4
−6 −6
V L O Y M C
−8 −8
Order information of production company (e.g. Web-site) for ISO-test chart (e.g. code=rha4ra-I0(1/3))
C V
xA4 = (161−8) mm, yA4 = 153 mm, xdA4 = 120 mm, ydA4 = 40 mm
M Picture A4 or C4 L
Y O
xA1 = 28 mm, yA1 = 109 mm, xdA1 = 120 mm, ydA4 = 84 mm xA5 = (161−8) mm, yA5 = 109 mm, xdA5 = 120 mm, ydA5 = 40 mm
Picture A1 or C1 Picture A5 or C5
xA21 = 17 mm, yA21 = 20 mm, xdA21 = 14 mm
O Y
Recommendation: Measure upper larger adjacent samples!
xA2 = 28 mm, yA2 = 65 mm, xdA2 = 120 mm, ydA2 = 40 mm xA6 = (161−8) mm, yA6 = 65 mm, xdA6 = 120 mm, ydA6 = 40 mm
Picture A2 or C2 Picture A6 or C6
L M
xA31 = 17 mm, yA31 = 20 mm, xdA31 = 14 mm
Recommendation: Measure upper larger adjacent samples!
V xA3 = 28 mm, yA3 = 21 mm, xdA3 = 245 mm, ydA3 = 40 mm C
Picture A3 or C3
Test chart no. (1/3) for color devices according to ISO 15775: compare www.actech.com.br/sc28
−8 −8
−6 C M Y O L V −6
−4 −4
−2 −2
INFIE03:IE−1CS36.EPS
Figure 2: Layout of picture and frame area of test charts 1 and 3
© ISO/IEC 1999 – All rights reserved
4
---------------------- Page: 7 ----------------------
ISO identification: 19980615-I0(2/4) ISO-reference material: code=rha4ra-I0(2/4)
Technical informations: (e.g. Web-site) Layout-file version IE−0CSA698
ISO/IEC 15775:1999(E)
−2 −2
−4 −4
−6 −6
−8 V L O Y M C −8
Order information of production company (e.g. Web-site) for ISO-test chart (e.g. code=rha4ra-I0(2/4))
xB41 = 8,5 mm, yB41 = 34,5 mm, xdB41 = 7,0 mm
C V
xB42 = 8,5 mm, yB42 = 26,0 mm, xdB42 = 7,0 mm
xB43 = 8,5 mm, yB43 = 17,5 mm, xdB43 = 7,0 mm
part 1
xB44 = 8,5 mm, yB44 = 8,5 mm, xdB44 = 7,0 mm
xB4 = 161 mm, yB4 = 153 mm, xdB4 = 112 mm, ydB4 = 40 mm
M Picture B4 or C4 L
Warning: Exact Position, size and distance of samples in picture B1
depend on manufacturer of ISO-test chart (intention: similar compared to picture B3!)
xB11 = 6,85 mm, yB11 = 19,85 mm, xdB11 = 7,7 mm
part 2
Y O
xB12 = 6,85 mm, yB12 = 7,85 mm, xdB12 = 7,7 mm
part 3
xB1 = 28 mm, yB1 = 109 mm, xdB1 = 130 mm, ydB1 = 86 mm xB5 = 161 mm, yB5 = 109 mm, xdB5 = 112 mm, ydB5 = 40 mm
Picture B1 or D1 Picture B5 or D5
O Y
xB2 = 28 mm, yB2 = 65 mm, xdB2 = 130 mm, ydB2 = 40 mm xB6 = 161 mm, yB6 = 65 mm, xdB6 = 112 mm, ydB6 = 40 mm
Picture B2 or D2 Picture B6 or D6
Recommendation: Measure larger adjacent samples!
L M
xB31 = 6,85 mm, yB31 = 25,35 mm, xdB31 = 7,7 mm
xB32 = 6,85 mm, yB32 = 13,35 mm, xdB32 = 7,7 mm
V xB3 = 28 mm, yB3 = 21 mm, xdB3 = 130 mm, ydB3 = 40 mm xB7 = 161 mm, yB7 = 21 mm, xdB7 = 112 mm, ydB7 = 40 mm C
Picture B3 or D3 Picture B7 or D7
Test chart no. (2/4) for color devices according to ISO 15775: compare www.actech.com.br/sc28
−8 −8
C M Y O L V
−6 −6
−4 −4
−2 −2
INFIE03:IE−2CS36.EPS
Figure 3: Layout of picture and frame area of test charts 2 and 4
Figure 2 shows the layout of test charts 1 and 3 with six pictures and a frame area around. The layout of the pictures
and the frame area is very similar to the basic layout of Figure 1. Instead of 16 there are now six pictures A1 to A6
and C1 to C6 in test charts 1 and 3 respectively.
Within the area of pictures A2 and A3 there is a square which represents the first sample (black) of the 5-step and
16-step grey scales. The x- and y-data of the square center is given relative to the left bottom corner of pictures A2
and A3. The grey sample distance of the 5- or 16-step grey series is 14 mm.
NOTE There are two additional samples which appear black (N ) and white (W ). In digital PS-files (or
0 1
equivalent) absolute or relative colorimetric space with lightness L* or l * = ( L* –L* ) / ( L* –L* ) can
relative N W N
be used. The colorimetric data L* = 0 and L* = 100 produce the darkest black (N ) and lightest white (W ) on
0 1
the material used, which may be different compared to L* and L* of the contrast range.
N W
Figure 3 shows the layout of test charts 2 and 4 with seven pictures and a frame area around. The layout of the
pictures and the frame area is very similar to the basic layout of Figure 1. Instead of 16 there are now seven pictures
B1 to B7 and D1 to D7 in test charts 2 and 4 respectively.
Within the pictures B1 and B3 (or D1 and D3) there are two squares which represent the first CIE-test colour and the
black sample of the 16-step grey scale. The x- and y-data of the square centers are given relative to the left bottom
corner of pictures B1 and B3 (D1 and D3). The sample distance of the steps is 7,7 mm.
Within the picture B4 (or D4) there are four squares which represent the first samples of colour series W–C, W–M,
W–Y, and W–N (or W–O, W–L, W–V, and W–N ). The sample distance of the steps is 7,0 mm.
4.2.3 Restrictions for layout and content of picture B1
In picture B1 of test chart 2 (which is identical to picture D1 of test chart 4) the subject matter may be chosen by the
manufacturer. Any picture which satisfies the following restrictions is allowed for an ISO-test chart manufacturer:
The picture B1 consists of three parts (compare layout of picture B1 in Figure 5).
Restrictions for the three parts of the picture B1:
Part 1: The picture must include a large variety of colours in the upper part (130 mm x 60 mm).
Part 2: 14 CIE-test colours plus black N (darkest black) and white W (whitest white) (130 mm x 11 mm).
0 1
Part 3: 16-step equidistant gray scale between black N (L* = 10) and white W (L* = 94) (130 mm x 15 mm).
N W
© ISO/IEC 1999 – All rights reserved
5
---------------------- Page: 8 ----------------------
ISO /IEC 15775:1999(E)
NOTE An ISO-test chart manufacturer can add in part 1 a black and white Siemens-star equal in size and
colour (L* and L* ) to the Siemens-star N–W of picture B2. A user will get important information about the
N W
actual resolution of identical Siemens-stars by the pixel image (picture B1) and direct vector based
reproduction (picture B2).
The intended colorimetric data for the 14 CIE-test colours and the 16-step equidistant grey samples are equal to the
intended data of these colours in picture B3.
NOTE 1 The photographic process (film material, taken illuminant exposure, development) used to take the
picture B1 (with the three parts in one exposure) and the scanning process producing the digital image will
result in different CIE-test colours and grey samples in pictures B1 and B3.
NOTE 2 By a least squares technique, a transform of the digital image data (e.g. RGB) is used to calculate
L*a*b* colorimetric data. If the L*a*b*-data of picture B1 are equal within 3 CIELAB units to the L*a*b*-data of
picture B3 then the colours in picture B1 and B3 appear equal.
4.2.4 Restrictions for digital image data and resolution of picture B1
ISO-test chart manufacturers must publish RGB-image data of the picture B1 in five resolutions:
192 x 128, 384 x 256, 786 x 512, 1536 x 1024, and 3072 x 2048.
NOTE 1 RGB-image data in these five resolutions may be (for example) produced by the KODAK-Photo-CD-
process with the option „Transfer to EPS (Encapsulated PostScript) (or equivalent) with 24 bit colour“.
NOTE 2 A transform from RGB-image data to L*a*b*-image data may be recommended by the ISO-test
chart manufacturer.
NOTE 3 In ISO-test charts within the header of the EPS-file (or equivalent) of the picture B1 numerical data
of a 3x4 matrix transform are given. The transformation from RGB-image data to L*a*b*-image data may be
(for example) calculated by a PS-interpreter (or equivalent).
NOTE 4 The transformation from RGB-image data to L*a*b*-image data is equal for all image resolutions.
The lowest resolution can be used to get a table of the RGB-image data of the 32 colours (14 CIE-test colours
+ N + W and the 16-step grey samples).
0 1
NOTE 5 The intended CIE-test and grey colours are known. This allows to calculate an optimized
transformation from RGB-image data to L*a*b*-image data.
NOTE 6 For negative film between 2 stops underexposure and 3 stops overexposure the RGB-image data
are very different. An optimized transform leads to L*a*b*-image data which produce very similar output.
4.2.5 Restrictions for producing ISO-test charts in halftone technique
A test pattern producer can use any line screen and must disclose the line screen used. The line screen used must
be described by a complete definition of the halftone type.
The halftone type definition includes either the entries:
„Width, Height and Threshold“ of „HalftoneType 3“
and/or
„Frequency, Orientation and SpotFunction“ of „HalftoneType 1“
An example of an „HalftoneType 3“-matrix used to produce halftone test charts is given in Annex J.
NOTE 1 This allows repeating the production at any time.
NOTE 2 Copiers often produce different output with test charts of identical colorimetric L*a*b*-data but with a
different halftone type.
4.3 Layout files and EPS-picture files (or equivalent)
Standard PS- and PDF-layout files (or equivalent) produce the A4-layout of the ISO-test charts. The standard layout
files produce only the layout without any picture content.
At specific lines within a PS-layout file (or equivalent) the content of the pictures is included. The content is defined in
„EPS-picture files“ (or equivalent).
Each EPS-picture file (or equivalent) of test charts 1 and 3 produces only one picture different in size between 120
mm x 40 mm (A2, A4, A5, and A6), 120 mm x 84 mm (A1), 245 mm x 40 mm (A3) (see Figure 2).
Each EPS-picture file (or equivalent) of test charts 2 and 4 produces only one picture different in size between 130
mm x 86 mm (B1), 130 mm x 40 mm (B2 and B3), and 112 mm x 40 mm (B4, B5, B6 and B7) (see Figure 3).
One can find the EPS-picture files (or equivalent) as „Technical information“. The standard EPS-picture files produce
the picture content located 25,4 mm in x- and y-direction from the left bottom corner of the output paper (see
Annex M).
© ISO/IEC 1999 – All rights reserved
6
---------------------- Page: 9 ----------------------
ISO identification: 19990301-I01 ISO-reference material: code=rha4rd-I01
Technical informations: (e.g. Web-site) Image-file version E1-1TS2199
ISO/IEC 15775:1999(E)
4.4 Digital PS-files and PDF-files (or equivalent) for ISO-test charts
Combined PS-files (or equivalent) include both the layout specification and the picture content. These PS-files (or
equivalent) are called the „digital“ ISO-test charts no. 1 to 4. They are shown in Figure 4 to Figure 7 reduced to half
size.
NOTE The output of line rasters in pictures A5, A6, C5, and C6 is often different for PS- and PDF-files (or
equivalent). ISO-test charts 1 and 3 show the reference output with line rasters.
−2 −2
−4 −4
−6 −6
−8 V L O Y M C −8
Order information of production company (e.g. Web-site) for ISO test chart (e.g. code=rha4rd-I00)
background step 0 1 ring step 0−1
Hex code Hex code
C V
7 8 7−8
E F E−F
10 20 30 10 20 30
2 0 2−0
8 6 8−6
F D F−D
Radial grating (Siemens-star) N−W Radial grating (Siemens-star) W−N Landolt-rings W−N code: background−ring
M Picture A4: Landolt-rings W−N L
120 128 136 144 152 160 168 176 184 192 200 208 216 224 232 240
120
(+8) 240
60
120
(+4)
10 20 30 10 20 30
30
(+2) 60
15
30
Y (+1) O
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Radial grating (Siemens-star) N−Z Radial grating (Siemens-star) W−Z line raster diameter in lpi
Picture A1: Radial gratings (Siemens-stars) N−W, W−N, N−Z, and W−Z Picture A5: Line raster under 45° (or 135°); PS-/PDF-output different!
10,0 31,0 52,0 73,0 94,0 N (min.) W (max.)
L* 0 1
CIELAB
120 128 136 144 152 160 168 176 184 192 200 208 216 224 232 240
(absolute)
120
240
(+8)
60
O (+4) 120 Y
30
60
(+2)
15
(+1) 30
l*
CIELAB, r 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
0,000 0,250 0,500 0,750 1,000 N0 (min.) W1 (max.)
(relative)
line raster diameter in lpi
Picture A2: 5 visual equidistant L*-grey steps + N0 + W1 Picture A6: Line raster under 90° (or 0°); PS-/PDF-output different!
10,0 15,6 21,2 26,8 32,4 38,0 43,6 49,2 54,8 60,4 66,0 71,6 77,2 82,8 88,4 94,0
L*
CIELAB
L M
(absolute)
Hex code F E D C B A 9876543210
l*
CIELAB, r
0,000 0,067 0,133 0,200 0,267 0,333 0,400 0,467 0,533 0,600 0,667 0,733 0,800 0,867 0,933 1,000
(relative)
V C
Picture A3: 16 visual equidistant L*-grey steps
Test chart no. 1 for color devices according to ISO 15775: compare www.actech.com.br/sc28
−8 −8
C M Y O L V
−6 −6
−4 −4
−2 −2
INFIE04:E1−1TS21.EPS
Figure 4: PS-file (or equivalent) output of digital ISO-test chart 1 (reduced to half size)
© ISO/IEC 1999 – All rights reserved
7
---------------------- Page: 10 ----------------------
ISO identification: 19990301-I02 ISO-reference material: code=rha4rd-I02 ISO identification: 19990301-I03 ISO-reference material: code=rha4rd-I03
Technical informations: (e.g. Web-site) Image-file version E1-2CS2199 Technical informations: (e.g. Web-site) Image-file version E1-3TS2199
ISO /IEC 15775:1999(E)
−2 −2
−4 −4
−6 −6
V L O Y M C
−8 −8
Order information of production company (e.g. Web-site) for ISO test chart (e.g. code=rha4rd-I00)
image pixel: 192 x 128
C
384 x 256
C V
768 x 512
M
1536 x 1024
Y
3072 x 2048
N
0123456789A B C D E F
Picture B4: 16 visual equidistant steps of colour series W−C, W−M, W−Y, and W−N
M L
+−:. lmno pqrs tuvw
pqrs
lmno
hijk lmno
xyz;
hijk hijk
defg +−:.
+−:.
tuvw
!abc
!abc xyz; xyz;
defg
pqrs tuvw
+−:. 4 N C M Y
defg
lmno xyz;
!abc
tuvw 6 N C M Y
hijk
pqrs
defg
Y O
8 N C M Y
!abc
10 N C M Y
Picture B1: Flower motif, 14 CIE-test colours acc. to to CIE publ. 13.3, and 2 + 16 grey steps Picture B5: Script and Landolt-rings in four sizes and in colours N, M, C, and Y
0−1 0−1
7−8 7−8
10 20 10 20 10 20 10 20 10 20 E−F E−F
O Y
2−0 2−0
8−6 8−6
F−D F−D
Radial grating W−C Radial grating W−M Radial grating W−Y Radial grating W−N Radial grating W−Z
Landolt-rings W−C Code Landolt-rings W−M Code
Picture B2: Radial gratings (Siemens-stars) W−C, W−M, W−Y, W−N, and W−Z Picture B6: Landolt-rings W−C, and W−M
0−2 0−1
L M
6−8 7−8
D−F E−F
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
4−0 2−0
9−5 8−6
F−B F−D
V C
Landolt-rings W−Y Code Landolt-rings W−N Code
Picture B3: 14 CIE-test colours acc. to CIE publ. 13.3, and 2 + 16 grey steps Picture B7: Landolt-rings W−Y, and W−N
Test chart no. 2 for color devices according to ISO 15775: compare www.actec
...
INTERNATIONAL ISO/IEC
STANDARD 15775
First edition
1999-12-01
Information technology— Office
machines — Method of specifying image
reproduction of colour copying machines
by analog test charts — Realisation and
application
Technologies de l'information — Machines de bureau — Méthode de
spécification de la reproduction d'image des copieuses couleur par des
organigrammes d'essai analogiques — Réalisation et application
Reference number
ISO/IEC 15775:1999(E)
©
ISO/IEC 1999
---------------------- Page: 1 ----------------------
ISO/IEC 15775:1999(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO/IEC 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body
in the country of the requester.
ISO copyright office
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 734 10 79
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO/IEC 1999 –
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.